Effect of Oxygen and Redox Potential on Glucose Fermentation inThermotoga maritimaunder Controlled Physicochemical Conditions

[摘要] Batch cultures ofThermotoga maritimawere performed in a bioreactor equipped with instruments adapted for experiments performed at 80∘C to mimic the fluctuating oxidative conditions in the hot ecosystems it inhabits. When grown anaerobically on glucose,T. maritimawas shown to significantly decrease the redox potential (Eh) of the culture medium down to about −480 mV, as long as glucose was available. Addition of oxygen intoT. maritimacultures during the stationary growth phase led to a drastic reduction in glucose consumption rate. However, although oxygen was toxic, our experiment unambiguously proved thatT. maritimawas able to consume it during a 12-hour exposure period. Furthermore, a shift in glucose metabolism towards lactate production was observed under oxidative conditions.

[学科分类] 微生物学和免疫学